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11.11.2008, 12:57 AM
not perse, but the pivot ball retainer centers the pivot ball in the knuckle so there is no real metal to metal contact. I've used stock, rpm, and aluminum knuckles, and have found the aluminum to turn more freely than the other two, and they are much much more durable
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.
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